Well, the Ozzy pack is the normal price for an 8=pack but with 2 Pro-guitar/bass upgrades thrown in for free for the 2 pack-only songs...
So this expirement pretty much screws both legacy and pro players...

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The most beautiful thing we can experience is the mysterious. It is the source of all true art and all science. Someone who can no longer pause to wonder, and stand rapt in awe, is as good as dead.